cocoa - xcode 中的 ConnectionKit 框架不适合我

Question

我尝试制作一个连接到 ftp 服务器的 Cocoa 应用程序。所有答案都建议使用连接套件框架，但不知何故我无法使用它。当我编译框架并将其添加到我的 xcode 项目并构建它时。我无法再运行该应用程序。我在左下角收到错误消息，提示应用程序已退出，状态为 5。

解决这个问题后，现在我在尝试构建时遇到 9 个错误:(此处复制粘贴)

AppDelegate.m:17: error: 'AbstractConnection' undeclared (first use in this function)
AppDelegate.m:50: error: syntax error before 'AbstractConnection'
AppDelegate.m:55: error: 'baseDirField' undeclared here (not in a function)
AppDelegate.m:56: error: syntax error before 'if'
AppDelegate.m:62: error: syntax error before 'AbstractConnection'
AppDelegate.m:69: error: syntax error before '}' token
AppDelegate.m:71: error: syntax error before 'AbstractConnection'
AppDelegate.m:75: error: syntax error before 'for'
AppDelegate.m:75: error: syntax error before '<' token

当尝试使用以下代码时(通过谷歌找到):

//  AppDelegate.h

#import < Cocoa/Cocoa.h >

@protocol AbstractConnectionProtocol;

@interface AppDelegate : NSObject {
 IBOutlet NSTextField *hostNameField;
 IBOutlet NSTextField *usernameField;
 IBOutlet NSTextField *passwordField;
 IBOutlet NSTextField *baseDirField;
 IBOutlet NSTextView *log;
 IBOutlet NSTextField *status;

 id <AbstractConnectionProtocol> con;

 BOOL isConnected;
}

- (IBAction) connect:(id)sender;
- (IBAction) disConnect:(id)sender;

@end

//  AppDelegate.m

#import "AppDelegate.h"
#import < Connection/Connection.h >

@implementation AppDelegate

- (IBAction) connect:(id)sender;
{
 NSError *err = nil;
 con = [[AbstractConnection connectionToHost:[hostNameField stringValue]
          port:@"21"
          username:[usernameField stringValue]
          password:[passwordField stringValue]
          error:&err] retain]; 
 if (!con)
 {
  if (err)
  {
   [NSApp presentError:err];
  }
  return;
 }

 NSTextStorage *textStorage = [log textStorage];
 [textStorage setDelegate:self];  // get notified when text changes
 [con setTranscript:textStorage]; 

 [con setDelegate:self];

 [status setStringValue:[NSString stringWithFormat:@"Connecting to: %@", [hostNameField stringValue]]];
 [con connect];

}

- (IBAction) disConnect:(id)sender;
{
 if( con )
 {
  [con disconnect];
 }

}
- (void)connection:(AbstractConnection *)aConn didConnectToHost:(NSString *)host
{
 isConnected = YES;
 [status setStringValue:[NSString stringWithFormat:@"Connected to: %@", host]];

 NSString *dir = [[baseDirField stringValue] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
 if (dir && [dir length] > 0)
  [con changeToDirectory:[baseDirField stringValue]];
 [con directoryContents];

}

- (void)connection:(AbstractConnection *)aConn didDisconnectFromHost:(NSString *)host
{
 isConnected = NO;
 [status setStringValue:[NSString stringWithFormat:@"Disconnected from: %@", host]];

 [con release];
 con = nil;
}

- (void)connection:(AbstractConnection *)aConn didReceiveContents:(NSArray *)contents ofDirectory:(NSString *)dirPath
{
 NSLog(@"%@ %@", NSStringFromSelector(_cmd), dirPath);
 int i = 0;
 for (i=0; i < [contents count]; ++i) {
  id object = [contents objectAtIndex:i];
  [[[log textStorage] mutableString] appendFormat:@"%@\n", object];
 }
}

@end

所以我想知道我做错了什么。

Answer 1

#import < Connection/Connection.h >

尝试删除这些空格。您不太可能有一个名为“Connection”的框架，其中包含名为“Connection.h”的头文件。